veyron/runtimes/google: allow for command line args to override runtime env vars.

This change allows for command line flags, in particular, those defined
in the flags.Runtime group (formerly called 'Essentials') to override
their corresponding environment variables.

Also, got rid of an unused option for specifying namespace roots and
sundry cleanups+bugfixes.

Change-Id: I32dd2e2849730029e35e9bf3e6a9a849ca2f4c98
8 files changed
tree: 96848dfb82af83db3600882dee6689b361ac00c2
  1. lib/
  2. profiles/
  3. runtimes/
  4. security/
  5. services/
  6. tools/